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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a44a44ed11bb8f5197229ec2b2f35152cebf91482a097207c4566719f90fb3' 
  AND token = 'TYohhfoVjkv4fxcw8O2UJnCEKtaflHy2xB57k5ww0Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}